A method of double interface coating to solve the flatulence of lithium titanate negative electrode of lithium ion battery
A lithium-ion battery, lithium titanate technology, applied in the direction of battery electrodes, electrical components, circuits, etc., to achieve the effect of improving cycle stability and cycle life
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Embodiment 1
[0018] Weigh Li according to weight percentage 18:1 4 Ti 5 o 12 and nano-TiN powder, using a ball mill for 2 hours to make the two fully mixed, and the mixed powder was placed in a resistance furnace at 600 °C for 4 hours under an Ar gas atmosphere, and then cooled to obtain TiN-coated Li 4 Ti 5 o 12 Negative electrode material, then, take 0.2g electrode material powder and disperse in 20mL10% polytetrafluoroethylene (PTFE) emulsion, ultrasonically disperse for 30 minutes, so that PTFE molecules are evenly coated on the surface of the electrode material, and finally centrifugally dry to obtain TiN-PTFE double coated Li 4 Ti 5 o 12 Negative material. The transmission electron microscope picture of gained powder product is shown in figure 1 . Li double coated with TiN-PTFE 4 Ti 5 o 12 Anode material, LiFePO 4 As the positive electrode material, celguard2500 diaphragm, electrolyte EC: DMC=1:1, 1molL -1 LiF 6 The 800mAh soft-pack lithium-ion battery assembled for th...
Embodiment 2
[0020] Take 0.2gLi 4 Ti 5 o 12 The anode material was dispersed in 10% cyanamide (CH 2 N 2 ) ethanol solution, dried in an oven at 60 °C for 3 h to obtain surface-coated CH 2 N 2 Li 4 Ti 5 o 12 powder, and then heat-treated the powder at 700 °C for 3 h under a nitrogen atmosphere to make CH 2 N 2 in Li 4 Ti 5 o 12 In situ decomposition of the surface into C 3 N 4 , cooled to obtain C 3 N 4 Surface-coated Li 4 Ti 5 o 12 electrode material. C 3 N 4 Surface-coated Li 4 Ti 5 o 12 The electrode material was dispersed in 5% LiF aqueous solution, ultrasonicated for 15 min and centrifuged, and dried at 50 °C for 4 h to obtain C 3 N 4 -LiF double-coated Li 4 Ti 5 o 12 Negative material. The XRD pattern and 0.1C charge and discharge pattern of the obtained product are shown in image 3 and Figure 4 , the results show that after C 3 N 4 -LiF double-coated Li 4 Ti 5 o 12 The negative electrode material maintains the spinel cubic structure well, and th...
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